[luatex] Logging of font names in box log output

[luigi scarso]

On Wed, Sep 9, 2015 at 5:21 PM, David Carlisle <d.p.carlisle at gmail.com>
wrote:

> With much help from Hans (and ignoring anything other than classic tfm
> fonts for now)
> I thought I'd close this thread with some successful code. This
> reports \b for both x and y
> in texlive 2015 luatex, to match pdftex output:
>
>
>
> \directlua{
> function mydeffont(n,s,i)
>   for ii,vv in font.each() do
>     if (n == vv.name) then
> % and s == vv.size
> % need to normalize size representations
> % just equality here fails to match
> print('font callback: ' .. n .. ' ' .. s .. ' ' .. vv.size)
>      f=ii
>     end
>   end
>   return f or font.read_tfm(n,s)
> end
> callback.register('define_font',mydeffont)
> }
>
>
>
> \font\a=cmr10
> \font\b=cmr10
>
> \setbox0\hbox{\a x\b y}
> \scrollmode
> \tracingonline1
> \showbox0
>
> \immediate\write16{a: \number\fontid\a}
> \immediate\write16{b: \number\fontid\b}
>
> \bye
>
>
>
> If I may could I request two additions to the luatex manual?
>
> a) list the new primitive \fontid in section 2.7 (or wherever else you
> feel makes sense)
>
> b) document that the define_font callback can return a fontid
> (integer) The manual
> documents it as returning a table, which meant I didn't know what to do
> having
> detected a duplicate, but I found this text in the changelog which led
> to the above.
>
> * The 'define_font' callback interface has changed a little.
> It is now:
> retval = function (name,size,fontid)
>
> where fontid is the internal font number of the font that
> is currently being defined, and retval can be either a table
> (as before) or a different, previously defined fontid. This is
> useful if a previous definition can be reused instead of
> creating a whole new font structure.
>
>
ok, I will do in a couple of days.





-- 
luigi
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